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### High School Mathematics - 21.7 Integers: Four Basic Operations Using Signed Numbers - Table

 Addition Answer Example Sum of two positive integers is always a positive number 4 + 5 = 9 Sum of a positive and negative integer is eitherpositive or anegative number 3 + -4 = -1 8 + -2 = 8 - 2 = 6 Sum of a negative and positive is either positive number or a negative number -3 + 4 = 1 -6 + 2 = -4 Sum of a two negative integers is always a negative number -3 + -4 = -7 -6 + -2 = -6 - 2 = -8 Subtraction Answer Example Difference of two positive integers is either positive or a negative number 7 - 5 = 2 5 - 7 = -2 Difference of a positive and negative integer is always positive number 3 - -4 = 3 + 4 = 7 6 - -2 = 8 Difference of a negative and positive integer is always negative number -3 - +4 = -3 - 4 = -7 -8 - +2 = -8 - 2 = -10 Difference of a two negative integers is either positive or a negative number -3 - -4 = -3 + 4 = 1 -6 - -2 = -6 + 2 = -4 Multiplication Answer Example Product of two positive integers is always a positive number 4 x 5 = 20 Product of a positive and negative integer is always a negative integers 3 x -4 = -12 Product of a negative and positive integer is always a negative number -3 x 4 = -12 Product of a two negative integers is always a positive number -3 x -4 = 12 -6 x -2 = 12 Division Answer Example Quotient of two positive integers is always a positive number 12/3 = 4 Quotient of a positive and negative integer is always a negative number 12/-4 = -3 Quotient of a negative and positive integer is always a negative number -12/4 = -3 Quotient of a two negative integers is always a positive number -12/-4 = 3

Example:
7 + -5
7 is bigger than 5, answer will be positive
Operation: subtract 7 + -5 = 7 -5 = 2

7 + -9
9 is bigger than 7 so the answer's sign is negative
operation is subtraction
7 + -9 = 7 - 9 = -2

-5 - (-7) = -5 + 7
7 is greater than 5 the answer's sign is negative
operation is subtraction
-5 + 7 = 7 - 5 = +2

Directions: Evaluate the following expressions. Also write at least five examples of your own for each case.
 Q 1: (-4) + 9 =-556 Q 2: 6 x -8 =-4848-36 Q 3: (-4) x -5 =4520-20 Q 4: (-20) ÷ -5 =-5-44 Q 5: (-6) - (-8) = -6 + 8 =23-3 Q 6: (-7) + -5 = -9-12-10 Q 7: 45 ÷ -9 =-44-5 Q 8: (-7) - +6 = -7 - 6 =-1-1313 Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!

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